Train Smarter.
Race Better.
Data-driven tools to dial in your nutrition, pacing, and race day strategy.
Even Splits Lab is where endurance training meets real numbers. Our articles break down how to train, fuel, and race smarter, with simple calculators to dial in your pacing, nutrition, sweat rate, and heart rate zones. Built for runners, cyclists, and triathletes who want data they can actually use.
The Lab Tools
Fuel Strategy
Running a half marathon? Most athletes need 60–90g of carbs per hour. Find your exact number in 2 minutes.
Plan Fuel
Sweat Rate
Lose more than 1L of fluid per hour without knowing it? Most athletes do. Find your hourly sweat rate in 2 minutes.
Run Test
Pacing Strategy
Want to run a sub-2:00 half? You need to hold 5:41/km. Enter your goal time and find the pace you actually need to hit.
Find Your Pace
HR Zone Finder
Training in Zone 2 but actually running in Zone 3? It happens more than you’d think. Get your personal zones in 2 minutes.
Find Your ZonesLatest From the Lab
Why Is My Zone 2 Pace So Slow? 7 Real Reasons
Your friends head out for an easy run and chat their way through 5:30 kilometres. You try the same thing with a heart rate cap and end up at 7:00, watch beeping, feeling like you’re barely moving. It’s easy to assume your zones are broken, or your body is. Usually neither is true. There are […]
What to Do If Your Bike Breaks Before Race Day
You pull your bike out of the travel case at the hotel and something’s off. Shifting hesitates, a hanger looks bent, or there’s a clunk that wasn’t there on your last ride at home. A mechanical during race week feels different from one during training. There’s no home shop with your maintenance history on file, […]
The Easiest Ironman 70.3 in North America: A Leg-by-Leg Guide
There’s no single “easiest Ironman 70.3.” Depending on which leg gives you the most trouble, swimming, biking, or running, a completely different race is the right call. A lot of “easiest 70.3” roundups also treat a current-assisted swim as one race’s unique selling point, when it’s actually a fairly common course feature. Augusta, Washington Tri-Cities, […]